Our hope was to fire six hundred charges, tulip-fashion, putting out of commission six kilometres of rail. Tulips had been invented by Peake and myself for this occasion. Thirty ounces of guncotton were planted beneath the centre of the central sleeper of each ten-metre section of the track. The sleepers were steel, and their box-shape left an air-chamber which the gas expansion filled, to blow the middle of the sleeper upward. If the charge was properly laid, the metal did not snap, but humped itself, bud-like, two feet in the air. The lift of it pulled the rails three inches up: the drag of it pulled them six inches together; and, as the chairs gripped the bottom flanges, warped them inward seriously. The triple distortion put them beyond repair. Three or five sleepers would be likewise ruined, and a trench driven across the earthwork: all this with one charge, fired by a fuse, so short that the first, blowing off while the third was being lighted, cast its debris safely overhead.